RTOS/TMS320C6678: PCIe BAR Data read from FPGA endpoint

Tool/software:TI-RTOS

Hello,

I am trying to read data using a C6678 customized board using PCIe. The C6678 is the RC and the FPGA is the EP on the PCIe bus.

I am able to perform link training and reading remote device ID and vendor ID, but they are swapped in order, that may be because of endianess mismatch.

I am following the example in the PCIE_exampleProject and also some modifications that I found on the TI E2E forum.

On FPGA side i have configured BAR0 and BAR1 of size 8MB.

On C6678 DSP side i configured outbound translation for region 1 and region 2.

Region 1: LO: 0x00100001, HI: 0x0

Region 2: LO: 0x00200001, HI: 0x0

After that i configured remote BARs of FPGA.

BAR0

pcieBarCfg_t barCfg;

barCfg.location = pcie_LOCATION_REMOTE;

barCfg.mode = pcie_EP_MODE;

barCfg.base = 0x00100000;

barCfg.prefetch = pcie_BAR_NON_PREF;

barCfg.type = pcie_BAR_TYPE32;

barCfg.memSpace = pcie_BAR_MEM_MEM;

barCfg.idx = 0;

BAR1

pcieBarCfg_t barCfg;

barCfg.location = pcie_LOCATION_REMOTE;

barCfg.mode = pcie_EP_MODE;

barCfg.base = 0x00200000;

barCfg.prefetch = pcie_BAR_NON_PREF;

barCfg.type = pcie_BAR_TYPE32;

barCfg.memSpace = pcie_BAR_MEM_MEM;

barCfg.idx = 1;

outbound translation and BAR configuration has been completed successfully.

But when i am trying to read data from region 1 (0x60800000) and region 2 (0x61000000), i am getting data alternates between 0x60800000 and an sequence starting with 0x01 that increases in steps of 2.

Please let me know which steps i am missing out in configuration and data reading.

Thanks